Cutting-off mechanism.



Patented luly l6, I901. R. H. HURLBUT.

CUTTlNG-UFF MECHANISM.

(Application filed Nov. 22, 1900.) (No Model.) 5 SheetsSheet l.

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R. H. HURLBUT.

CUTTING-OFF MECHANISM.

(Application filed Nov. 22, 1900.)

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(No Model.)

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R. H. HUBLBUT.

CUTTING-OFF MECHANISM.

(No Model.) (Application filed Nov. 22, 1900.) 5 sheets sheet 3.

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B. H. HURLBUT.

GUTTING OFF MECHANISM.

(Application filed Nov. 22, 1900.) (No Model.)

No. 678,569. Patented July I6, I901.

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N0. 678,569. Patented July l6, 19m.

R. H. HUBLBUT.

CUTTING-DFF MECHANISM.

(Application filed Nov. 22, 1900.) (No Model.) 5 Sheets-Sheet 5.

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RUFUS H. HURLBUT, OF SUDBURY, MASSACHUSETTS.

CUTTING OFF MECHANlS.

SPECIFICATION forming part of Letters Patent No. 678,569, dated July 16,1901.

Application filed November 22, 1900. Serial No. 37y352i (No model.)

To to whom it may concern:

Be it known that 1, Burns H. HURLBUT, of Sudbury,in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Cutting OE Machines, of which the following is aspecification.

My invention relates to that class of on ttingoff machines in which arevoluble hollow mandrel holds the material to be cut off and atool-carriage is so connected to a variablespeed driving apparatus thatthe movement of the tool toward the axial line of the mandrel increasesthe speed of said mandrel, so as to present to the cutting edge of thetool a substantially even speed of the material being worked.

My present invention is designed to provide a more simple and reliableconnection of the working parts of the machine; and it consists ofimprovements which are fully set forth in this specification and thedrawings therewith, of which Figure 1 is a plan; Fig. 2, a View from thecutting end of the machine; Fig. 3, a side View; Fig. 4, a section on'line 4. 4 of Fig. 3; Fig. 5, a detail showing the stop movement; Fig. 6,a detail showing the gear connections of the driving mechanism.

The same letters and figures refer to like parts in all the drawings.

On a suitable frame A is mounted ahollow 1 mandrel revoluble in bearingsG O.

B represents a shaft contained in the hollow mandrel and being operatedon by cutting-tools, as seen in Fig. 2. Motion is imparted to saidmandrel as follows: Power is applied through belts to the pulleys D D,so thattheyrevolveinoppositedirections. Each is attached to a shaft E E,on the opposite end of which is mounted a friction-wheel F F. The shaftsE E are mounted in sleeves which are adapted to slide longitudinally inways or bosses G G, attached to the frame of the machine. (See Fig. 1.)The frictionwheels F F run between two disks H H, mounted the one onshaft J, the other, H", on a sleeve L about said shaft. (See Fig. 6.)The sleeve L carries disk H and also a pinion M, which meshes with thelarge gear As the disk H revolves in the opposite direction from H, itis necessary to connect it by intermediate gearing to gear 0, which isdone by extending the shaft J through the sleeve L and mounting thereonthe gear N, which meshes with a similar gear N on a sleeve which carriesa gear M, engaging with gear 0 and of the same size as gear M, whichalso engages with gear 0 upon the mandrel.

In Fig. 2 are seen the cutting-tools P P, operating upon opposite sidesof the bar B. These tools are clamped in the tool-blocks R R, whichslide in ways at right angles to the axis of the mandrel and are movedsimultaneously as follows: The shaft J, Fig. 6, which carries the disk11, extends beyond the frame of the machine and carries a conepulley S,Fig. 1,from which a beltruns to cone pulley S upon one end of a shaft T,which extends from end to end of the machine out side the frame andcarries upon its other end a worm V, Fig. 2, which engages with the gearW, mounted upon a shaft X, which is at right angles to the frame of themachine and which carries a worm 1, which engages with gear 2 upon shaft3, which also carries pinion 4C. This pinion 4 engages with two racks 5and 6-oue above and one belowwhich are attached by arms 7 and 8,respectively, to the sliding toolblocks R R. Thus it will be seen thatby the revolution of the shaft J motion is transmitted to the tools P P,thereby feeding them simultaneously toward the center of the shaft Bbeing operated upon.

The speed of the revolving mandrel is varied and controlled by thedistance of the tools from its central axis, as follows: To one of thetool-blocks R is attached a connecting-bar 9, whose opposite end ispivoted to a crank-arm 10 upon a shaft 11, hung in brackets 12 12 fromthe frame of the machine and parallel therewith. (See Fig. 1.) Upon theopposite end of the shaft is mounted a crankarm 13, from which aconnecting-bar 14 is attached to the sliding frame 15, which is attached to and controls the shaft E of the friction-wheel F. The shaft E,carrying the other friction-wheel F, is controlled by a similar slidingframe 16. Between these frames 15 and 16 is a pinion 17, mounted on astud attached to the frame of the machine. This 15 is communicated to16, but in an opposite.

direction. By this it will be seen that the position of thetool-carriage R controls the distance of the friction-wheels F F fromthe center of the disks H H, and consequently the speed of the mandrel,and as the tools approach the axis of the mandrel the frictionwheelsapproach the center of the disks, and the speed of the mandrel isincreased accordingly.

The means provided for disengaging the feed of the cutting-tools andbringing them back from the central axis of the mandrel is as follows:The shaft X, carrying worm l and gear W, and also the adjacent end ofshaft T are mounted in bearings upon a block 18, which is pivoted to themain frame at 19 and held in working position by a latch 20, Fig. 5, aspring 27, pressing against a stud 28, serving to hold the latch inengagement until forced away, as hereinafter described. The shaft 3,carrying gear 2 and pinion 4, is required to make only a partialrevolution in any case to give the necessary throw to the tool-blocks Rand R. A stud 21, attached to a wheel on shaft 3, is adjusted in such aposition that as the tools approach the central axis of the mandrel it(the stud) engages a lever 22, which is attached to the catch 20 andthrows the latch out of engagement with its latch 23 and allows theblock 18, with all its su perincumbent gearing, to drop far enough todisengage worm 1 from its gear 2. This movement at one end of the shaftT is provided for as to its bearing 24 at the other end by being pivotedso as to allow a slight angular motion. As the worm-wheel 1 isdisengaged from its gear 2 the tools are automatically drawn back fromthe central axis by a weight 26, attached by a cord to lever 25 and hungas shown.

A special feature of myinvention is the connection of the twotool-carriages with each other by racks and an intermediate pinion andalso the connection of the friction-Wheel carriers by the same device.

By the use of a rack instead of the usual cross feed-screws on thetool-carriage I save much time in reversing the tools, and the samedevice is applicable to a single tool-machine.

I do not claim anything shown or described in Letters Patent No.490,426, dated January 24:, 1893; but A V l I claim- 1. In a machine ofthe character described, a revoluble mandrel, a tool-carriage adapted toslide at right angles to the axial line of said mandrel, a rackconnecting therewith, a pinion meshing into said rack, mechanism fordriving said pinion and thereby feeding said toolcarriage toward theaxial line of the mandrel, in combination with means for disengagingsaid driving mechanism from said pinion and mechanism whereby saidpinion when disengaged will be automatically turned on its axis in areversed direction thereby bringing the tool-carriage away from theaxial line of the mandrel substantially as described.

2. In a machine of the character described, in combination with arevoluble mandrel, two tool-carriages adapted to move at right angles tothe axial line of said mandrel, racks attached to each of saidcarriages, an intermediate pinion meshing with both racks, and mechanismfor operating said pinion, consisting of a shaft carrying said pinion,another shaft parallel with said pinion shaft and driven from themandrel-driving mechanism, a third shaft at right angles to the twoshafts mentioned and connected to each by wormgearing,arranged and tooperate substantially as herein set forth.

' 3. In a machine of the character described the following mechanism forcommunicating the motion of the tool-carriers to the speed- Varyingmechanism, viz: a rocker-shaft, two arms rigidly attached to the same ator near the opposite ends thereof, connecting-bars pivotally attached tosaid arms, one of said bars being attached to the tool-carriage and theother to one of the sliding frames which carries one of thefriction-wheels, whereby the motion of the tool-carriage toward theaxial line of the mandrel operates to move the friction-wheels towardthe center of the disk thus accelerating the movement of the mandrelsubstantially as shown and described.

In testimony whereof I have aflixed my signature in presence of twowitnesses.

RUFUS H. HURLBUT.

Witnesses:

JAMES H. WILLIAMS, ALBERT C. Y. MACADAM.

